Ultrafast optical observation of spin-pumping induced dynamic exchange coupling in ferromagnetic semiconductor/metal bilayer

Liu, X.; Liu, P.; Yuan, H. C.; Shi, J. Y.; Wang, H. L.; Nie, S. H.; Jin, F.; Zheng, Z.; Yu, X. Z.; Zhao, J. H.; Zhao, H. B.; Lüpke, G.

doi:10.1038/s41598-022-19378-z

Title: Ultrafast optical observation of spin-pumping induced dynamic exchange coupling in ferromagnetic semiconductor/metal bilayer

Journal Article · Tue Nov 22 00:00:00 EST 2022 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-022-19378-z· OSTI ID:1899631

Liu, X.; Liu, P.; Yuan, H. C.; Shi, J. Y.; Wang, H. L.; Nie, S. H.; Jin, F.; Zheng, Z.; Yu, X. Z.; Zhao, J. H.; Zhao, H. B.; Lüpke, G.

Abstract Spin angular momentum transfer in magnetic bilayers offers the possibility of ultrafast and low-loss operation for next-generation spintronic devices. We report the field- and temperature- dependent measurements on the magnetization precessions in Co ₂ FeAl/(Ga,Mn)As by time-resolved magneto-optical Kerr effect. Analysis of the effective Gilbert damping and phase shift indicates a clear signature of an enhanced dynamic exchange coupling between the two ferromagnetic (FM) layers due to the reinforced spin pumping at resonance. The temperature dependence of the dynamic exchange-coupling reveals a primary contribution from the ferromagnetism in (Ga,Mn)As.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DEFG02-04ER46127

OSTI ID:: 1899631

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 12 Journal Issue: 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

References (18)

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